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  <div class="section" id="dbm-utilities-get-preos-params">
<h1>dbm_utilities.get_preos_params<a class="headerlink" href="#dbm-utilities-get-preos-params" title="Permalink to this headline">¶</a></h1>
<dl class="function">
<dt id="dbm_utilities.get_preos_params">
<code class="sig-prename descclassname">dbm_utilities.</code><code class="sig-name descname">get_preos_params</code><span class="sig-paren">(</span><em class="sig-param">Tb</em>, <em class="sig-param">M</em>, <em class="sig-param">rho</em><span class="sig-paren">)</span><a class="reference internal" href="../../_modules/dbm_utilities.html#get_preos_params"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#dbm_utilities.get_preos_params" title="Permalink to this definition">¶</a></dt>
<dd><p>Get the parameters required by the Ping Robinson Equation of State</p>
<p>We estimate the parameters required by the Ping Robinson equation of
state using the methods in Twu (1984) and by Kesler and Lee reported in
Chen et al. (1993). These are the critical point temperature, pressure,
and specific volume and the acentric factor. We also estimate the binary
interaction parameters using a method in Pedersen et al. (2014).</p>
<p>In theory, the Twu and Kesler and Lee correlations should only be used
for pseudo-components above n-C6, and literature property values should
be used for pseudo-component below n-C6. When these lighter compounds are
present, it is best for each molecule to have its own component
properties.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><dl class="simple">
<dt><strong>Tb</strong><span class="classifier">np.array</span></dt><dd><p>Array of boiling point temperatures for each pseudo-component in the
oil (K).</p>
</dd>
<dt><strong>M</strong><span class="classifier">np.array</span></dt><dd><p>Array of molecular weights for each pseudo-component in the oil 
(g/mol).</p>
</dd>
<dt><strong>rho</strong><span class="classifier">np.array</span></dt><dd><p>Density of each pseudo-component in the oil (kg/m^3).</p>
</dd>
</dl>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><dl class="simple">
<dt><strong>Tc</strong><span class="classifier">np.array</span></dt><dd><p>Array of critical point temperatures for each pseudo-component in the
oil (K).</p>
</dd>
<dt><strong>Pc</strong><span class="classifier">np.array</span></dt><dd><p>Array of critical point pressures for each pseudo-component in the
oil (Pa).</p>
</dd>
<dt><strong>Vc</strong><span class="classifier">np.array</span></dt><dd><p>Array of critical point specific volumes for each pseudo-component in 
the oil (m^3/mol).</p>
</dd>
<dt><strong>M</strong><span class="classifier">np.array</span></dt><dd><p>Array of the molecular weights of each pseudo-component in the oil 
(kg/mol).</p>
</dd>
<dt><strong>omega</strong><span class="classifier">np.array</span></dt><dd><p>Array of acentric factors (–) for each pseudo-component in the oil.</p>
</dd>
<dt><strong>delta</strong><span class="classifier">np.array</span></dt><dd><p>Two-dimensional array of the binary interaction coefficients (–) 
for the interactions of each pseudo-component in the oil.</p>
</dd>
</dl>
</dd>
</dl>
<p class="rubric">Notes</p>
<p>The references used here are:</p>
<p>Chen, D.H., Dinivahi, M.V., Jeng, C.Y., 1993. New acentric factor
correlation based on the Antoine equation. Ind. Eng. Chem. Res. 32,
241-244.</p>
<p>Pedersen, K.S., Christensen, P.L., Shaikh, J.A., 2014. Phase Behavior of
Petroleum Reservoir Fluids, 2nd ed. CRC Press, Boca Raton, Florida.</p>
<p>Twu, C.H., 1984. An internally consistent correlation for predicting the
critical properties and molecular weights of petroleum and coal-tar
liquids. Fluid Phase Equilib. 16, 137-150.</p>
</dd></dl>

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